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Program Control Statements
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// Use continue using System;
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PART I
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class ContDemo { static void Main() { // Print even numbers between 0 and 100 for(int i = 0; i <= 100; i++) { if((i%2) != 0) continue; // iterate ConsoleWriteLine(i); } } }
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Only even numbers are printed, because an odd number will cause the loop to iterate early, bypassing the call to WriteLine( ) In while and do-while loops, a continue statement will cause control to go directly to the conditional expression and then continue the looping process In the case of the for, the iteration expression of the loop is evaluated, then the conditional expression is executed, and then the loop continues Good uses of continue are rare One reason is that C# provides a rich set of loop statements that fit most applications However, for those special circumstances in which early iteration is needed, the continue statement provides a structured way to accomplish it
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return
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The return statement causes a method to return It can also be used to return a value It is examined in 6
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The goto
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The goto is C# s unconditional jump statement When encountered, program flow jumps to the location specified by the goto The statement fell out of favor with programmers many years ago because it encouraged the creation of spaghetti code However, the goto is still occasionally and sometimes effectively used This book will not make a judgment regarding its validity as a form of program control It should be stated, however, that there are no programming situations that require the use of the goto statement it is not necessary for making the language complete Rather, goto is a convenience that, if used wisely, can be a benefit in certain programming situations As such, the goto is not used in this book outside of this section The chief concern most programmers have about the goto is its tendency to clutter a program and render it nearly unreadable However, there are times when the use of the goto can clarify program flow rather than confuse it The goto requires a label for operation A label is a valid C# identifier followed by a colon The label must be in the same method as the goto that uses it and within scope For example, a loop from 1 to 100 could be written using a goto and a label, as shown here:
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x = 1; loop1: x++; if(x < 100) goto loop1;
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Part I:
The C# Language
The goto can also be used to jump to a case or default statement within a switch Technically, the case and default statements of a switch are labels Thus, they can be targets of a goto However, the goto statement must be executed from within the switch That is, you cannot use the goto to jump into a switch statement Here is an example that illustrates goto with a switch:
// Use goto with a switch using System; class SwitchGoto { static void Main() { for(int i=1; i < 5; i++) { switch(i) { case 1: ConsoleWriteLine("In goto case 3; case 2: ConsoleWriteLine("In goto case 1; case 3: ConsoleWriteLine("In goto default; default: ConsoleWriteLine("In break; } ConsoleWriteLine(); } // } } goto case 1; // Error! Can't jump into a switch
case 1");
case 2");
case 3");
default");
The output from the program is shown here:
In case 1 In case 3 In default In In In In case 2 case 1 case 3 default
In case 3 In default In default
5:
Program Control Statements
Inside the switch, notice how the goto is used to jump to other case statements or the default statement Furthermore, notice that the case statements do not end with a break Since the goto prevents one case from falling through to the next, the no fall-through rule is not violated, and there is no need for a break statement As explained, it is not possible to use the goto to jump into a switch If you remove the comment symbols from the start of this line
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